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VK, known as Mail.ru Group until 2021, is a Russian internet company. It was started in 1998 as an e-mail service and went on to become a major corporate figure in the Russian-speaking segment of the Internet. As of 2013 according to comscore, websites owned by VK collectively had the largest audience in Russia and captured the most screen time.

VK's sites reach approximately 86% of Russian Internet users on a monthly basis and the company is in the top 5 of largest Internet companies, based on the number of total pages viewed. Mail.ru controls and operates the 3 largest and most popular Russian social networking sites, VK (social network), Odnoklassniki, and Moi Mir, respectively. Mail.ru also holds minority stakes in Qiwi, formerly OE Investments (15.04%) and operates two instant messaging networks (Mail.ru Agent and ICQ), an e-mail service and Internet portal Mail.ru, as well as a number of online games. In October 2021, Mail.ru Group was rebranded as VK, after its most popular property.